Window updates are much slower under 12.04 than 10.10

[Ron Johnson]

See question #195487, which I think was wrongly assigned to xserver-xorg-video-nv.
https://answers.launchpad.net/ubuntu/+source/xserver-xorg-video-nv/+question/195487

To rehash question #195487: I just upgraded from GNOME 2.32 on a PPA-loaded Maverick 10.10 to 12.04 using GNOME Classic No Effects.

Window updates are noticeably slower in apps like gnome term, pysolfc and nethack-x11, while some gtkperf tests are significantly slower on my machine than on my wife's slower machine.

I ran it under all of the Unity and GNOME variants and the times weren't significantly different.

This is a list of the significantly slower gtk operations (along with a couple of faster operations):
http://pastebin.com/M0Ed92Ta

We both have the nvidia 295.40 driver installed.
She still runs a PPA-loaded Maverick system.

My system has an Athlon II X4 640 CPU with GeForce 210 GPU while she has a Phenom II X2 555 with 8400GS GPU. Does screen size matter?

The monitor, video card and binary driver are the same today as they were 48 hours ago (when I upgraded).

I get 3400fps in glxgears and Tux Racer responds well, so it's NOT bug #982485.

It was a clean install from the 64 bit Live DVD, so there's . (Since /home is on it's own partition, I'm able to upgrade w/o much worry.)

# lshw -C display
  *-display
       description: VGA compatible controller
       product: GT218 [GeForce 210]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
       configuration: driver=nvidia latency=0
       resources: irq:18 memory:fb000000-fbffffff memory:b0000000-bfffffff memory:ce000000-cfffffff ioport:ef00(size=128) memory:c0000000-c007ffff

# lsb_release -a
LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:cxx-3.0-amd64:cxx-3.0-noarch:cxx-3.1-amd64:cxx-3.1-noarch:cxx-3.2-amd64:cxx-3.2-noarch:cxx-4.0-amd64:cxx-4.0-noarch
Distributor ID: Ubuntu
Description: Ubuntu 12.04 LTS
Release: 12.04
Codename: precise

# uname -a
Linux haggis 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

# dpkg -l | grep nvidia
ii nvidia-common 1:0.2.44 Find obsolete NVIDIA drivers
ii nvidia-current 295.40-0ubuntu1 NVIDIA binary Xorg driver, kernel module and VDPAU library
ii nvidia-settings 295.33-0ubuntu1 Tool of configuring the NVIDIA graphics driver

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: libgtk-3-0 3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
Uname: Linux 3.2.0-24-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Tue May 1 16:47:15 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gtk+3.0
UpgradeStatus: No upgrade log present (probably fresh install)